<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品照片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
            >
              <el-input
                v-model="addForm.goods_price"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
            >
              <el-input
                v-model="addForm.goods_weight"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
            >
              <el-input
                v-model="addForm.goods_number"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop="goods_cat"
            >
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <!-- 渲染表单的Item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb,i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <!-- action表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button
                size="small"
                type="primary"
              >点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >
          <!-- 富文本编辑器组件 -->
          <quill-editor v-model="addForm.goods_introduce"></quill-editor>
          <!-- 添加商品的按钮 -->
          <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return{
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    {required:true,message:'请输入商品名称',trigger:'blur'}
                ],
                goods_price:[
                    {required:true,message:'请输入商品价格',trigger:'blur'}
                ],
                goods_weight:[
                    {required:true,message:'请输入商品重量',trigger:'blur'}
                ],
                goods_number:[
                    {required:true,message:'请输入商品数量',trigger:'blur'}
                ],
                goods_cat:[
                    {required:true,message:'请选择商品分类',trigger:'blur'}
                ]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
              expandTrigger:'hover',
              value:'cat_id',
              label:'cat_name',
              children:'children'
            },
            // 动态参数列表数组
            manyTableData:[],
            // 静态属性列表数组
            onlyTableData:[],
            // 上传图片的URL地址
            uploadURL:'http://www.ysqorz.top:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
            
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res}=await this.$http.get('categories')

            if(res.meta.status!==200){
                return this.$message.error('获取商品分类数据失败！')
            }

            this.catelist=res.data
            console.log(this.catelist)
        },
        // 级联选择器选中项变化会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页名字是：', + oldActiveName)
            // console.log('即将进入的标签页名字是：', + activeName)
            // return false
            if(oldActiveName === '0'&&this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        async tabClicked(){
            // console.log(this.activeIndex)
            // 证明你访问的是动态参数面板
            if(this.activeIndex==='1'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}
                }
                )

                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败！')
                }

                console.log(res.data)
                res.data.forEach(item =>{
                    item.attr_vals =
                    item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex==='2'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}
                }
                )
                if(res.meta.status!==200){
                    return this.$message.error('获取静态属性失败！')
                }

                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath = file.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // 1.获取将要删除的图片的临时路径
            const filePath=file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i =this.addForm.pics.findIndex(x=>x.pic===filePath)
            // 3.电泳数值的splice 方法，把图片信息对象，从pics数组移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)

        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // 1.凭借得到一个图片信息对象
            const picInfo={pic:response.data.tmp_path}
            // 2.将图片信息对象，push到pics到数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                // 执行添加的业务逻辑
                // loadash cloneDeep(obj)
               const form= _.cloneDeep(this.addForm)
                form.goods_cat=form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                // 发起请求添加商品
                // 商品的名称必须是唯一的
                const { data:res }=await this.$http.post('goods',form)
                if(res.meta.status!==201){
                    return this.$message.error('添加商品失败！')
                }

                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length=== 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width:100%;
}
.btnAdd{
    margin-top:15px;
}
</style>